The Study of Serum Vitamin D Level In Patient With Pulmonary Hypertension And Right Ventricular Systolic Dysfunction Detected by Transthoracic Echocardiography. JUBPAS [Internet]. 2018 Mar. 7 [cited 2025 Apr. 19];26(5):86-94. Available from: https://journalofbabylon.com/index.php/JUBPAS/article/view/863